After a few minutes of training, or meditating, to be exact...
"I did it!"
Raven succeeded in keeping his presence under his control!
Releasing his presence to the max output really did make his training much easier just as Ruby said.
Anyway, Ruby approached Raven...
"You're amazing, you learned so fast."
Then she said that.
Ruby is genuinely amazed by Raven's ability to take in others' teaching like how a sponge would greedily absorb water.
After hearing her voice, Raven faced Ruby.
He then put on a sweet smile on his face unconsciously...
"It's all thanks to you."
And mumbled those words sincerely!
"Grgh..."
Raven's words tickled Ruby very well!
Her ears are getting red, and she's even struggling to keep herself from smiling like an idiot!
So in the end...
"Heh! Of course, I'm great at teaching!"
Ruby turned her back against Raven and boasted.